Business Segment Information (Details 1) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Identifiable assets	$ 7,161.7	$ 7,101.2	$ 6,404.7
Depreciation and amortization	168.9	172.2	162.5
Purchase accounting depreciation and amortization	21.4	18.4	21.0
Capital expenditures	141.7	116.9	122.9
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Identifiable assets	2,600.7	3,012.3	2,536.1
Depreciation and amortization	3.2	1.5	1.5
Capital expenditures	69.6	50.7	36.7
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	147.5	153.8	141.5
Architecture and Software [Member]
Segment Reporting Information [Line Items]
Identifiable assets	2,482.8	2,054.3	1,790.5
Depreciation and amortization	69.3	75.0	69.7
Capital expenditures	30.0	24.7	29.4
Control Products and Solutions [Member]
Segment Reporting Information [Line Items]
Identifiable assets	2,078.2	2,034.6	2,078.1
Depreciation and amortization	75.0	77.3	70.3
Capital expenditures	$ 42.1	$ 41.5	$ 56.8